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Casts are not only useful when converting between types in an assignment. They can be used within an expression. For example, consider the following program. It uses a cast to double to obtain a fractional component from an otherwise integer division.

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Business rules, as discussed in 6, can be implemented in various ways throughout an IT system. Not all business rules will be implemented in the data model and ultimately the physical database. Because we re not inviting debate on exactly where all business rules should go, we focus on those that belong in the data model, usually because they specifically relate to data integrity.

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When we name our tables, we use a convention of prefacing the table with tbl_ followed by a meaningful name. We do this so that you can quickly identify a table when looking at objects or queries. Some people would argue that it is obvious which objects are tables, because they are listed as tables in the SQL Server tools and they are always referenced in the same places in T-SQL statements. We agree with the first argument, but as for the second, it forgets about views. Views and tables are referenced in the same way, and it is often helpful to be able to quickly identify whether a view or table is being used when you re looking at a T-SQL statement. Additionally, you might need to look at documentation, such as a data dictionary, offline. It is again helpful to be able to quickly identify your tables. As for the actual name, we make sure it s meaningful and we separate words with underscore characters. One other important note: We never pluralize the names of our tables. The table is named for the data it holds, as in tbl_customer; even though it holds multiple customers, we do not name the table tbl_customers. Here are some of the tables you will see in the Mountain View Music database:

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In 5 you were shown a simple sorting method called the bubble sort. It was mentioned that substantially better sorts exist. Here you will develop a version of one of the best: the quicksort. The quicksort, invented and named by C.A.R. Hoare, is the best general-purpose sorting algorithm currently available. The reason it could not be shown in 5 is that the best implementations of the quicksort rely on recursion. Thus, it makes an excellent example to show the power of recursion in action. The version we will develop sorts a character array, but the logic can be adapted to sort any type of object you like. The quicksort is built on the idea of partitions. The general procedure is to select a value, called the comparand, and then to partition the array into two sections. All elements greater than or equal to the partition value are put on one side, and those less than the value are put on the other. This process is then repeated for each remaining section until the array is sorted. For example, given the array fedacb and using the value d as the comparand, the first pass of the quicksort would rearrange the array as follows:

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Naming guidelines are extremely important when you create your physical model. There are literally hundreds of naming standards out there, and each has its pros and cons. At the end of the day, it doesn t matter which standard you use, as long as you use a standard. Why is a naming standard so important First, it provides a quick indicator of the type of object you are working with. If all tables start with the same prefix, such as table or tbl, and if all views start with vw or view, then you will be able to tell at a glance where data is coming from. This practice can save a lot of time and is especially helpful if you find yourself looking at T-SQL code that is not performing well. Also, when performance tuning, you will have different considerations for views than